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It is the function of a patent claim to define the scope of the invention protected by the patent. Infringement occurs when an accused system, article, or process is covered by the particular terminology used in a patent claim. Many inventions are combinations, e.g. a system, article, or process made up of two or more elements, components, or steps that work together to provide some new and useful function or result. Claims directed to such inventions must therefore recite the relevant combination.
A generic example of a combination claim is: ‘a widget including element A, element B, and element C.’ In this example, the word ‘including’ is a transitional term signifying that what follows is a list of elements, each of which must be present in a widget that falls within the scope of the claimed invention.
The choice of transitional terms in combination claims can be significant. To illustrate, if I tell you that my breakfast this morning
included coffee and toast, you would probably not assume that this was necessarily the entire content of my breakfast. My statement would be true if I also had cereal and juice. Similarly, if I were to add that my coffee
contained milk, you might suppose that I could also have added sugar. On the other hand, if I were to say that my breakfast
consisted of coffee and toast, you would naturally understand me to be saying that this is all that I had for breakfast today.
But what if I were to tell you that my breakfast
comprised coffee and toast? If you are a patent attorney, and you know that I am also a patent attorney, then in all likelihood you would understand that I am not excluding the possibility that my breakfast included other elements. If you are not a patent attorney, then you might think it odd that I would choose an uncommon and potentially confusing word like ‘comprised’, when I could just as easily have been clear and said ‘included’ or ‘consisted of’.
The fact is that in a number of major jurisdictions the transitional term ‘comprises’ (and variations, such as ‘comprising’) is essentially regarded as a ‘
term of art’ in patent drafting. The US Patent and Trade Marks Office
Manual of Patent Examining Procedure,
Section 2111.03, lists a number of rulings of the US Court of Appeals for the Federal Circuit (CAFC) to the effect that the term ‘comprising’ is ‘inclusive or open-ended and does not exclude additional, unrecited elements or method steps.’ In the 1997 case of
Genentech, Inc. v Chiron Corp. 112 F.3d 495 the CAFC expressly stated that: ‘”Comprising” is a term of art used in claim language which means that the named elements are essential, but other elements may be added and still form a construct within the scope of the claim.’ Similarly, the European Patent Office
Guidelines for Examination,
Part F, Chapter 4, Section 4.21, states that: ‘While in everyday language the word “comprise” may have both the meaning “include”, “contain” or “comprehend” and “consist of”, in drafting patent claims legal certainty normally requires it to be interpreted by the broader meaning “include”, “contain” or “comprehend”.’
Internationally, then, the settled expectation of many practitioners drafting patent specifications and claims is that the words ‘comprises’ and ‘comprising’ can safely be used to indicate that the elements or steps recited in a combination are not intended to be exhaustive. Thus a claim defining ‘a widget
comprising element A, element B, and element C’ will be infringed not only by an unauthorised widget consisting only of elements A, B, and C, but by widgets including these elements along with one or more additional elements that are not essential to the functioning of the claimed invention.
Those international practitioners may therefore be surprised to learn that ‘comprises’, and its variants, enjoy no such presumption of non-exhaustiveness in Australia, as a judge of the Federal Court of Australia recently reminded us in
Nichia Corporation v Arrow Electronics Australia Pty Ltd (No 4) [2017] FCA 864.